Initially, this Sharp model is an LCD type TV. A simple test is to shine a flashlight at an angle towards the blackened screen. Aim towards the area where the volume level is usually shown. Press on the volume control Up/Down. If semblance of the level could be seen even darkly, then the problem with the Sharp would be a backlighting issue. Backlight as the term implies, refers to the soft whitish glow provided by small tube like bulbs behind the screen. This then would almost always be a hardware fault, not a setting nor a configuration concern and would require that the Aquos be opened up to effect repairs.

Options then are:

consider a DIY (do-it-yourself) repair if and only if comfortable working with electronic components & circuitry, use of a DVM/VOM, a soldering iron/station and safe practices with electrically powered devices. Access to a Service Manual or at the very least, a schematic diagram would be a necessity;

should you be uncomfortable with a DIY, perhaps your best bet would then be to consult with and/or seek the services of an authorized Sharp Service Center (specially if still under some form of extended warranty) or a qualified professional.

If a DIY is being considered, possible suspects are:

CCF (cold cathode florescent) lamps (least likely);

controller (a possibility);

power supply particularly to the inverter (likely);

inverters (most likely).

The inverters are responsible for supplying the high frequency high voltage power used by the CCF lamps. Due to heat related issues, capacitors tend to leak and/or bulge which causes them to fail. The same would hold true for the power supply.

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